Machine for straightening barrels



W. A. SCHMIDT.

MACHINE FOR STRAIGHTENING BARRELS.

APPLICATION FILED DEC. 13. I918- 1,367,099. Patented Feb. 1, 1921.

4 SHEETS-SHEET I.

WITNESSES: Q r INVENTOI? fi Mam/ AM;

A TTORNEY W. A. SCHMIDT.

MA-CHINE FOR STRAIGHTENING BARRELS.

APPLICATION FILED DEC. 13. 1918.

1,367,099. Patented Feb. 1,1921.

4 SHEETS-SHEET 2.

W. A. SCHMIDT.

MACHINE FOR STRAIGHTENING BARRELS.

APPLICATION FILED DEC. 13 I918.

W. A. SCHMIDT.

MACHINE FOR STRAIGHTENING BABRELS.

APPLICATION FILED DEC. 13, 1918.

1,867,099. Patented Feb. 1,1921.

4 $HEETS-SHEET 4.

I NI "EN TORv ATTORNEY.

UNITED STATES,

PATENT OFFICE.

WILHELM A. SCHMIDT, OFJLION, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO REMINGTON ARMS COMPANY, INC., 015 NEW YORK, N. 'Y., A CORPORATION OF DELAWARE.

MACHINE FOR STRAIGHTENING BARRELS.

ing or pulling operation can be utilized to carry out the process, I have found it necessary for an economical utilization of the process to employ a special machine Wl.11Ch will rapidly perform the stretching o eration. This machine forms the subject 0 th1s application.

It in an object of my invention to provide a machine which will stretch rifle bar-- rels or similararticles a short distance-as, for example, an inch or two-to thereby straighten them and relieve all lnternal strains.

A further object is to provide a machine of this nature which will perform this work expeditiously and economically.

To this end it is a further object to provide such a machine having work-holding means which will quickly receive, grasp, stretch and release the work.

Other objects relate to certain structural details as will later appear.

The invention is illustrated in the accompanying-drawings in which- Figure 1 shows my improvedmachine in perspective.

Fig. 2 is a side elevation thereof, certain parts being cut away to show the internal construction. I

Fig. 3 is a perspective view of the drawhead, parts being broken away to show the internal construction.

Fig. 4 is a vertical sectional view of the draw-head, and the holding collar, the barrel being shown in dotted lines.

Fig. 5 shows a central horizontal sectional view of the draw-head.

Fig. 6 illustrates a horizontal section of a modified holding means which may be sub stitutedfor the holding collar shown in Fig. 4.

Specification of Letters Patent.

Patented Feb. 1, 1921.

Application filed December 13, 1918. Serial No. 266,619.

Fig. 7 is a plan view of another modified form, while v Fig. 8 is a perspective View of a part of the structure shown in Fig. 7

Referring to Fig. 1, the numeral 1 designates the base of the machine, 2 designates a, horizontally extending arm which may, if desired, be supported by the vertical standard 3. Spanning the space between the base 1 and. the standard 3 I may provide a shelf 2 underlying the arm 2.

. Referring more particularly to Fig. 2, the base 1 is provided with upwardly extending standards 13 and 1A which carry at their lower portions the horizontally extending shaft 8 carrying the belt pulleys 5 and 6, the pulley 6 bemg fastened to the shaft 8 for rotation therewith, while pulley 5 is loosely mounted on said shaft. Any suitable means 7 may be provided forshifting the driving belt from one of these pulleys to the other for starting or stopping the machine, as is well understood.

The shaft 8 is provided with pinions 9 and/10. The pinion 9 engages with a large driving gear 11 which is journaled on a bearing sleeve 12 mounted in the standard 13. The standard 14. supports a shaft 18' on which is mounted an idler pinion 18 which engages the pinion 10 and the gear 15 journaled on the sleeve 15 mounted in the standard 1 1.

The ram 30 extends through the sleeves 12 and 15 and thegears 11 and 15 and/its threaded rear end carries the nut 16 which is mounted for rotation but restricted against longitudinal movement between the sleeves 12 and 15. Slidably mounted upon this nut and preferably feather-keyed thereto is the clutch collar 17 which carries which will turn the clutch collar 17 and nut 16 and cause they ram 30 to be drawn backward; that if the clutch collar is moved to its central position no movement will be transmitted to the nut and if it is moved against the gear 15 that the nut will be rotated in the opposite direction and that the ram will therefore be moved forward. This reversal of direction is due to the intervening idler gear 18. It is also seen that while the backward movement of the ram is very slow its return movement will be comparatively rapid. The backward movement which is the working stroke of the machine will therefore be accomplished with a high mechanical advantage, while the idle return stroke will be very rapid, to consume a minimum of time. In order to prevent a possible overrunning of the nut and clutch collar it may sometimes be desirable to provide a brake for the collar such as the spring pressed brake 17 Any suitable means may be provided for shifting the clutch collar, such as an arm 19 carried by a horizontally disposed shaft 19journaled in the frame. The arm 19 carries a projection which is received in the groove 20 in the collar 17 for sliding said collar, as is common in the art. Attached to the end of the shaft 19 is the crank 21 suitably connected by a link 22 with the lever 23 which is pivoted on a stud 24 attached to the arm 2. The upper end of this lever is suitably connected to the rod 25 which is slidably supported in the bearing 26 carried by the arm 2. Adjustably mounted upon this rod are the collars 27 and 28 which may be secured at any desired point by set screws.

It is of course to be understood that this exact form of operating means for the clutch is not essential, but that any suitable means may be employed.

Fixedly secured to the front end of the ram 30 for reciprocation therewith is the draw-head which is generally designated by the numeral 31. Suitable means are provided on the draw-head for cooperating with the collars 27 and 28. This means may eonsist of a laterally extending lug 32 which carries a pin 33 extending downwardly therefrom for engaging the collars 27 and 28.

This constitutes an automatic means for stopping the movement of the draw-head at any desired predetermined point. Manual means are also provided for controlling the clutch. This may consist of a shaft 33 suitably journaled in the arm 2 and carrying at one end a crank 3a which may be connected to the rod 25 by any desired means such as the connecting link 34'. The other end of the shaft 33 is provided with an arm 35, to the upper'end of which is suitably connected a control rod 36 which has a bearing in a bracket 37 and may be provided with a handle 38. It will be understood that the reciprocation of the rod 36 will reciprocate the rod 25, rotate the shaft 19 and shift the clutch collar to any desired position.

I The draw-head will now be described in detail. (See Figs. 3 and 4.) The drawhead may generally consist of the two parts l0 and 41, one of these parts being provided with any suitable slot such as the T slot -13, the other part being provided with a correspondingly shaped tongue 44k to be received in said slot. v The sides of the drawhead may be provided with grooves l2 which have a bearing on guide ribs l2 formed on the arm 2. This will provide a suitable support for the draw-head and while permitting sliding movement will nevertheless prevent rotation of the draw-head and its attached ram.

Part 1-1, which may be formed in two parts held together by bolts 41', is provided with an interior cavity formed by the vertical walls 44' and the substantially horizontally extending walls 45. This cavity is open toward the front end of the head to receive the barrel to be stretched. noted that while the walls if may be substantially parallel, the walls l5 are not so, but converge toward the front part of the head. Mounted within this cavity are the jaws 46 and 47 provided with substantially parallel faces 47' facing each other and suitably serrated to grip the work. To provide for the suitable guiding of the jaws it may be necessary to provide them with guide grooves 48 and 49 parallel to their back surfaces, pins 50, which may be formed as screws, being mounted in the draw-head to project into the guide grooves.

The rear part of each of the jaws is provided with lugs 51 and 52 which receive the pin 53 which holds the jaws alined and upon which is mounted the rack bar 54 slidably mounted in the head. A pinion 55 is carried by a shaft 56 rotatably mounted in the bearing bushings 57 and 58. Attached to the upper end of this shaft is the crank 59. Suitably connected to the crank 59 is an operating rod 60 which may be provided with a handle (31. This rod is supported by the brackets 62 and G3, bracket 62 being supported by the draw-head and moving therewith. while the bracket 63 is carried by the arm .2.

The draw-head may be provided with a suitable bracket, such as the one shown at 42, with an axially disposed aperture for receiving and guiding the end of the forging to be stretched.

Referring now to Fig. at, the face plate (35 is suitably attached as by bolts 66 to the end of the arm 2. Secured to this face plate is the holding collar 67 suitably attached thereto as by bolts 68. The face plate is provided with a central aperture 69 to permit the insertion of the work into the machine. This type of holding collar can be used only when working on barrels or other articles which have an enlarged end as is usual in high power rifles such as military arms.

It will be is forced between the jaws 46 and 47 which receive the small end of the barrel. The openin of the jaws may have been previously e ected by manipulating the operatin rod 60. When the barrel has been inserted in the machine so that its enlarged end coninclined surfaces 45 of the cavity will cause the jaws to be clamped upon the barrel. The operator now pulls the operating rod 36 forward, which will rock the clutch arm 19 to cause the clutch to be engaged with the drive gear 11, which will rotate the nut 16 and cause the ram and draw-head to be drawn backward to straighten and stretch the barrel.

It will readily be seen that the tension on the barrel will cause the jaws to move forward in the head and to be wedged tighter against the barrel. It is obvious that the elongation of the barrel will continue until the pin 33 strikes the collar 28 and moves the rod '25 sufiiciently to cause the disengagement of the clutch collar from the gear wheel 11. The movement of the draw-head will then stop. This movement of the rod 25 is not sufficient to cause the engagement of the clutch-with the gear 15 and it will now be necessary for the operator to push the rod 36 rearwardly, which will cause the rapid return of the drawhead, and permit the release of the jaws from the work by the manipulation of the operating rod 60. i

It will often be desirable to use this machine for straightening barrels or other articles which are not formed with enlarged ends, in which case means will necessarily be provided for gripping the forward end of the work also. This result may be obtained by the modified construction shown in Fig. 6, wherein the usual face plate 65 is provided with a holding head suitably attached to the face plate as by bolts 71. This holding head is provided w ith a wedge shaped cavity similar to the one in the draw head and similar jaws 72 are provided for gripping the work. These jaws may be wedged against the work by any desired means, such as, for example, a link 73 pivoted to a pin 73 operated by a hand lever 76 pivoted at to the holding head 70.

In Figs. 7 and 8 I have shown another modified form of my invention, showing it adapted for pulling straight barrels'or barrels substantialy cylindrical. When this construction is used, face plate 65 is removed and in its place is substituted a holding head which may comprise a special form of face plate 80 to which is secured, preferably by a T slot connection, a casing composed of thetwo halves 81 and 82 bolted together by bolts and nuts 83. The casing is provided with a tapering internal cavity similar to the cavity in the drawhead 31, in which are located the complemental jaws 85 and' 86 similar to the jaws in the drawhead. Each of these jaws is provided on its opposite sides with grooves 87 parallel with their outside faces. The casin carries a number of pins 88, preferably thread ed therein, projecting into these grooves. The purpose of these pins is the same as that of pins 50, namely, to open the jaws when they are retracted. The rear ends of the jaws are provided with projections 85 and 86 provided with alined openings for receiving the pin 89. Upon this pin is mou'nt- .ed a rack 89' which-1ies in a depression formed in the jaws. Coiiperating with this rack is a pinion 90 mounted on a shaft 90 which has half of its bearing in the casing part 82. The other half of the bearing is formed in a plate 91 bolted as at 92 to the casing part 82. Attached to the shaft 90, preferablyby means of a nut 90". threaded on a threaded extension of the shaft, is the arm 93. t

The operation ofthis part of the device is obvious. When the arm 93 is drawn back, the shaft 90 is rotated, carrying with it the pinion 90 which draws the rack 89' to the left carrying with-it the pin 89 and the jaws 85 and 86. On account of the inclined surface of the jaws they are forced together and grip whatever is placed between them.

It is obvious that the arm 93 could be operated directly by the hand of the operator but since the jaws 85 and 86 will generally be operated at the same time that jaws 46 are operated, I have found it desirable to provide some means so that both sets of jaws may be operated by a single control means. In order that both jaws may firmly clamp upon the forging, which is likely to vary considerably in diameter, it will be necessary to provide a construction wherein the clamping of one set of jaws upon the work will cause them and their operating connections to act as a fulcrum to permit the operation of the other set of jaws, and where the-connecting parts will not interfere with the relative movement between the two sets of jaws. These results are obtained by providing the hand lever 96, preferably provided with a handle 97, pivotally connected to the arm 93 as at 98. At the endof the lever 96 is pivoted a link 100, as at 99. The other end of the link is pivoted, as at 101, to the arm 59 which controls the jaws in the movable draw-head 31.

I have found it desirable to provide a stop 94, preferably attached to the face plate 80, to limit the forward motion of the arm 93. Similarly, a stop may be provided to limit the motion of the arm The outer end of the lever 96 may be. bent upward as at 102 to prevent interference of the parts. In the operation of the machine. the handle 97 is pushed forward until the arms 93 and 59 abut their respective stops. The jaws will then be open and the forging 103 may be passed through the space between the jaws 85 and 86 and between the jaws a6 and 47. The lever 96 is then drawn back ward as far as possible. This causes the arm 93 to be rocked backward until the resistance set up by the closing of the jaws upon the work permits the lever 93 to act as a fulcrum and causes the link to rock the arm 59 to jaw closing position. It is of course obvious that the other set of jaws may be closed first. in which event the arm 59 will provide a fulcrum permitting the application of the force to the arm 93. It will be seen also that the connections shown will not interfere with the motion of the draw-head. Another advantage of this con struction is that the same system of levers may be used with forgings which vary considerably in length.

It will be readily seenthat I have provided a machine which will effectively and economically stretch and straighten barrels or other like articles, and while the machine is of special application for working on rifle barrels it is evident that it may also be effectively used for stretching articles of any kind and that its detailsas for example. the jaw constructionmay be useful in other relations. \Vhile I have described my improved machine in more or less detail to comply with the requirements of the statute, it is nevertheless desired that this detailed description be considered merely as illustrative and not as limiting, and it is to be understood that changes and modifications in the machine. may be made by those skilled in the art without departing from the invention as defined in the following claims 1. In a machine for stretching rods, the combination of a support, stationary holding means carried by the support. a movable drawhead slidably mounted on said support. said drawhead being provided with a cavity and gripping aws in said cavity, said cavity and jaws being so constructed as to cause opening and closing of the jaws when moved lengthwise in said cavity.

2. In a machine for stretching rods, the combination of a support, stationary holding means carried by the support, a movable drawhead slidably mounted on said support. said drawhead being provided with a cavity, gripping jaws in said cavity and manual means for sliding said jaws in the cavity.

3. In a machine for stretching rods, the combination of a support, stationary holding means carried by the support, a movable drawhead slidably mounted on said support. said drawhead being provided with a cavity, gripping jaws in said cavity, said cavity and jaws being so constructed as to cause opening and closing of the aws when moved lengthwise in said cavity and manual means for sliding said jaws in the cavity whereby said jaws may be manually opened and closed.

4. In a machine for stretching rods, the combination of a support, stationary holding means carried by the support, a movable drawhead slidably mounted on said support. said drawhead being provided with a cavity. gripping jaws in said cavity and manual means for sliding said jaws in the cavity, said means comprising a pinion in said drawhead and means connected to the jaws and cooperating with said pinion whereby rotation of said pinion will move the jaws in the cavity.

A machine for stretching rods. comprising a drawhead having a cavity formed with converging walls, jaws in said cavity cooperating with said walls and rack and pinion means for moving said jaws in the cavity.

6. A machine for stretching rods, comprising a drawhead having a cavity formed with converging walls, jaws in said cavity cooperating with said walls, and rack and pinion means for moving said jaws in the cavity, said means comprising a rack connected to the jaws and a pinion cooperating therewith.

7. A machine for stretching rods. comprising a drawhead having a cavity formed with converging walls, jaws 1n said cavity cooperating with said walls and means positively guiding the jaws for movement parallel to said converging walls.

8. A machine for stretching rods, comprising a drawhead having a cavity formed with converging walls, jaws in said cavity cooperating with said walls and means positively guiding the jaws for movement parallel to said converging walls, said means comprising guide grooves in one of said parts receiving projections carried by the other.

9. A machine for stretching rods, comprising a drawhead having a cavity formed with converging walls, jaws in said cavity cotiperating with said walls and means positively guiding the jaws for movement parallel to said converging walls, said means comprising guide grooves in said jaws receiving projections carried by the drawhead.

10. A machine for stretching rods, comprising a drawhead having a cavity formed a with converging walls, jaws in said cavity cooperating with said walls and means positively guiding the jaws for movement parallel to said converging walls, said means comprising guide groovcs in said jaws receiving removable projections carried by the drawhead.

11. A machine for stretching rods, comprising a drawhead having a cavity formed with converging walls, jaws in said cavity cooperating with said walls and means positively guiding the jaws for movement parallel to said converging walls, said means comprising guide grooves in said jaws receiving screws carried by the drawhead.

12. A machine for stretching rods, comprising a drawhead having a cavity formed with converging walls, jaws in said cavity cooperating with said walls, alined openings in said jaws, a pin in said openings and means connected to said pin for sliding said jaws.

13. A machine for stretching rods, comprising a draw-head having a cavity formed with converging walls, jaws in said cavity cooperating with the said walls, alined openings in said jaws, a pin in said openings and means connected to said pin for sliding said jaws, said means comprising a rack attached to the pin and a pinion cooperating with said rack.

14. A machine for stretching rods, comprising a draw-head having a cavity formed with converging walls, jaws in said cavity cotiperating with said walls, alined open-' ings in said jaws, a pin in said openings and means connected to said pin for sliding said aws, said means comprising a rack attached to the pin and a pinion cooperating with said rack, a shaft trunnioned in said draw-head and means for rotating said shaft. j

15. In a machine for stretching rods, a movable draw-head, a stationary holdin head, rod gripping. jaws in said draw-hea and holding head, external means for operating said aws and a single control means for actuating said jaw-operating means at will.

16. In a machine for stretching rods, a

movable draw-head, a stationary holding head, rod gripping jaws in said draw-head and holding head, external means for operating said jaws and a single manual control means for actuating said jaw-operating means at will. p a

17 In a machine for stretching rods, a movable draw-head, a stationary holding head, rod gripping jaws in said draw-head and holding head, external means for operating said jaws and a single manual control means for actuating said jaw-operating means at will,- said control means being so constructed and arranged that the reaction of either set of jaws will set up a fulcrum forthe operation of the other set.

18. In a machine forstretching rods, a movable draw-head, a stationary holding head, rod gripping jaws in said draw-head and holding head, external means for operating said jaws and a single control means for actuating said jaw-operating means at will, said control means being so constructed and arranged that it will permit the necessary relative motion between the draw-head and the holding head.

19. In a machine for stretching rods, a movable draw-head, a stationary holding head, rod gripping jaws in said draw-head and holding head,external means for operating said jaws and a single control means for actuating said jaw-operating means at will, said control means being so constructed and arranged that the reaction of either set of jaws will set up a fulcrum for the operation of vthe other set, and to permit the necessary relative motion between the draw-head and the holding head.

20. In a machine for stretching rods, a

movable draw-head, a stationary holding head, rod gripping jaws in said draw-head and holding head, external means for operating said jaws and a single control means for actuating said jaw-operating means at will, said control means comprising a hand lever pivoted to the operating means for one set of jaws and pivoted at another point to a link connected to the operating means for the other set of jaws.

21, In a machine for stretching rods, a movable draw-head, a stationary holdin head, rod gripping jaws in said-draw-hea and holding head, operating means for each set of jaws comprising crank arms, a hand lever pivoted to one of said crank arms and provided with means for operating the other crank.

22. In a machine for stretching rods, a movable draw-head, a stationary holding head, rod gripping jaws in said draw-head and holding head, operating means for each set of jaws comprising crank arms, a hand lever pivoted to one of said crank arms and a link pivoted to another part of said hand lever and to the other crank arm.

In testimony whereof I afiix my signature.

WILHELM A. SCHMIDT. 

